import math

X = int(input())

if X>=30:
    aircon='Yes'
else:
    aircon='No'

print(aircon) import math math X = int(input()) X int(input()) int input() input if X>=30:
    aircon='Yes'
else:
    aircon='No' X>=30 X 30 aircon='Yes' aircon 'Yes' aircon='No' aircon 'No' print(aircon) print aircon aircon='No' 'No' aircon X = int(input()) int(input()) X aircon='Yes' 'Yes' aircon
import math

X = int(input())

if X>=30:
    aircon='Yes'
else:
    aircon='No'

print(aircon)